Detailed Information

Cited 0 time in webofscience Cited 0 time in scopus
Metadata Downloads

Susceptibility of Stimuli-Responsive Hydrogels With Embedded Magnetic Microparticles for Inductively Wireless Chemical Sensing

Authors
Park, J. H.Song, S. H.Ochoa, M.Jiang, H.
Issue Date
Jan-2022
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
Stimuli-responsive hydrogel; susceptibility; magnetic particles; brown rotation
Citation
IEEE SENSORS JOURNAL, v.22, no.2, pp.1121 - 1127
Journal Title
IEEE SENSORS JOURNAL
Volume
22
Number
2
Start Page
1121
End Page
1127
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/145937
DOI
10.1109/JSEN.2021.3130304
ISSN
1530-437X
Abstract
Stimuli-responsive hydrogels with embedded magnetic microparticles (i.e., ferrogel) can be integrated with a planar LC circuit to remotely monitor environmental changes via electromagnetic resonant frequency measurements. To investigate the sensing mechanism from the point of view of magnetic susceptibility, we conducted magnetic characterizations of ferrogel swelling/deswelling in response to stimuli (i.e., pH), an indication of the extent of physical restrictionof the particles. Within 4 hours, a 2 x 2 mm(2) ferrogel can achieve an equilibrium swelling, reaching 10.8 times of its original weight when at pH 6, compared to 2.8 times when at pH 4. The magnetic remanence of the ferrogel is 3 emu/g, revealing a thermally blocked Neel relaxation; moreover, by comparing the complex susceptibility of the ferrogel between its equilibrium swelling and complete dry, the gel is found to have a Brown characteristic frequency at 2.2 Hz. When the gel switches from pH 4 to pH 6, the magnetic susceptibility of the gel increases from 2.99 x 10(-7) emu/oe to 3.27 x 10(-7) emu/oe, achieving a sensitivity of 3.5 x 10(-9) (emu/oe)/pH per swelling ratio between pH 4 and pH 6. These data verified that the ferrogel works as a magnetic core to tune the magnetic capacity (i.e., inductance) and thus resonance frequency of its incorporated sensing system through its volumetric response to external chemical stimuli.
Files in This Item
There are no files associated with this item.
Appears in
Collections
ICT융합공학부 > 전자공학전공 > 1. Journal Articles

qrcode

Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher Song, Seung Hyun photo

Song, Seung Hyun
ICT융합공학부 (전자공학전공)
Read more

Altmetrics

Total Views & Downloads

BROWSE